Screen for projecting apparatus.



No. 890,101. PATENTED JUNE 9, 1908 A. L. SIMPSON.

SCREEN FOR 'PROJEGTING APPARATUS.

APPLICATION FILEQAUG. 15. 1907.

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ALFRED L. SIMPSON, OF NEW YORK, N. Y., ASSIGNOR TO IDA L. SIMPSON, OF NEW YORK, N. Y.

SCREEN FOR PROJ'ECTING APPARATUS.

T call whom it may concern:

Be it, known that I, ALFRED L. SiMrsoN, a citizen of the United States, and a resident of New York,.in the county of New York and State of New ,York, have invented certain new and useful Improvements in the Screen for Projecting Apparatus, of which the following is a s ecification.

My invention re ates to the art of pro jecting ima es, and it has for its object a invention.

In the projection of images, either stationary or, moving, as at present carried out by the usual and well known apparatus, the screen upon which the images are projected is in the dark as well as the )lace in which the observers are, in order that the said images may appear with sufficient brilliancy to enable said observers to clearly distinguish the same.

The object of my invention is to avoid the darkening of the room or place in which the screen is placed, so that the lights forming the usual illumination as in a theater or hall may be left burning while the images are being projected. For this purpose I project the images by means of projecting apparatus such as the lantern 10, or other well 'known forms of projecting apparatus, upon a specially prepared screen 11; and

prefer also to somewhat increase the intensity of the'foeused light. The screen consists of a base 11 provided with a surface 12 upon which the images are projected. Such a surface may be either smooth or bright, or relatively rough and dull The screen is best prepared by providing a suitable base 11 with a surface 12 preferably composed of minute metallic particles.

I prefer to employ powdered aluminum or aluminum bronze mixed with a suitable vehicle such as amyl acetate or varnish, as a coating. The screen may, however, con- Specification of Letters Patent.

Application filed August 15, 1907.

Patented June 9, 1908.

Serial No. 388,742.

sist simply of a metallic sheet such as a sheet of aluminum or metallic compositlon resembling the same. I may also form a composition for the surface by grinding tin foil or other material colored with the three primary colorsred, yellow and blue forming thereby a compositesurface which Wlll bring out more erfectly the colors when projecting colore images. When an image is projected upon a screen of this character it appears with perfect clearness, notwithstanding the usual illumination existing in the hall or the like in which the said image is being projected. This is due to the fact that a screen of this character possesses the property of reflecting a relatively greater proportion of the focused rays than the usual screens employed.

By actual experiment in which two screens were hung side by side in a room of the usual illumination (one screen being perfectly white and the other coated with a preparation of aluminum powder), it was found that when a picture was thrown screen was very unsatisfactory and indistinct, while the picture on the latter screen ap eared perfectly snappyand brilliant.

claim':

1. A screen for projected images consisting of a base 'of suitablo'material, and a metallic coating of the character specified.

2. A screen for projected images consisting of a base of suitable material, and a coating of metallic particles of the char acter specified.

3.. A screen for projected images consisting of a base of suitable material, and a coating of powdered aluminum.

4. A screen for projected images consisting of a base of suitable material, and a colored, metallic coating of the character specified.

Signed at New York in the county of New York and State of New York.

ALFR D; lat-SIMPSON. 

